Wired Network: Dhcp For Mac
This article will walk you through setting up a Windows Vista device to work with the wired ethernet on campus using DHCP. For Windows 7, 8.1, or 10, see Microsoft's article to. See for configuring DHCP on Macs.
1. Register for DHCP with your Wired MAC Address If you haven't already, register your device on the campus network so that it can receive a valid IP with our ethernet cables (if you are not on campus, ensure that you can connect to the wired network where you are). You will need to use your WIRED (physical) MAC address. See for instructions on finding your device's address. See for instructions on registering your device on our network. Configure DHCP Ethernet for Windows Vista. Click the Start button and select Control Panel. Under Network and Internet, click the View network status and tasks link.
On the left side of the window, click Manage network connection. Right-click Local Area Connection and select Properties. Select Internet Protocol Version 4 and click the Properties button. Select Obtain an IP address automatically and click the OK button. Close any open windows and restart your computer.
How DHCP Works in Wired/Wireless network In a Network where they have Wireless and Wired Network, can they have the same DHCP server that hands out IP addresses for both Networks. I believe that they can have on DHCP with separate scope for wireless. For instance if I have a Laptop that use sometimes Wireless and sometimes wired Network, in this case DHCP server will hand out 2 IP addresses since 2 different Adapters(wired/wireless), then how DHCP will update the A record in DNS, with IP given to the wired or to the wireless adapter? Any clarification on this will be very much appreciated Thanks. You can use a single DHCP server on as many subnets as you want. You just have to make sure the router (and probably your APs) is set up to forward DHCP requests to the server for subnets that are different than the DHCP server's.
Once you do that, you can add a scope for each subnet on the DHCP server. The router feature that allows you to do this is called IP Helper, and you would need to make sure your router supports it (cheaper routers/WAPs don't support it). The way you set it up depends on the Router you're using, so it's not really possible to give instructions without knowing the router manufacturer/model. Also, DHCP doesn't register clients in DNS. Clients can be configured to register themselves in DNS, though. That is controlled on the Network Controller's settings in Windows.
If you have a system that switches between subnets regularly, it will change the DNS record to match its current IP address as long as it's configured to register itself in DNS. A network is a group of devices A wireless access point (Wifi router) is simply a way for gaining access to that network. A wired connection (cable) is simply a way for gaining access to that network.
DHCP assigns IPs based on Mac Addresses. The assigned address gets registered in DNS as belonging to that name. If you lookup the name with NSLOOKUP then the name of the device is returned. If you lookup the ip with NSLOOKUP then typically NSLOOKUP will return the FIRST IP DNS finds as the IP for the device. In most cases these days, Windows by default prefers WIRED connections and won't use wireless unless they are on two different networks (as defined by the IP Address and Subnet mask). The answer depends on the equipment in some sense. For example, if you put a wireless access point on a network that otherwise has NO DHCP server then it can be that ONLY wireless clients will get addresses.
This may be because they are the only ones asking for a lease but I think it goes beyond that. So the DHCP is reserved for wireless clients in those cases and with some equipment. On the other hand, if the access point has no DHCP service and the network does otherwise, the requests should be forwarded on the network to the DHCP server. Not very definitive but perhaps useful. Example: ComputerA has: Wirless Adapter:70-B1-1C-70-A1-B1 Wired Adapter:90-B1-1C-79-A0-B3 When ComputerA uses wireless connection, it will get IP 10.0.0.10 from DHCP, when it uses Wired it will get 192.168.0.20. Regarding DHCP server, in order to have separate scopes 10.0.0.x/16 and 192.168.0.x/16 does the DHCP server need to have 2 Network Adapters?
DHCP server,as far as I know, it updates DNS on behalf of the client. So on DNS there will be: ComputerA: IP 10.0.0.10 ComputerA: 192.168.0.20 when computerA powers On, then I do not think there will be a problem, since It will try to connect to the wired network, if there is no wired connection it will try wireless connection.what if the old IP address is not released, there could be a connection issue? Now if ComputerX tries to connect to ComputerA ( That has 2 IP addresses in DNS) which one will respond to computerX? Probably CopmuterX tries to connect to the IP that is not used by the ComputerA, and it fails? If you have a 10.x.x.x and a 192.x.x.x then you have two different networks. If that's the case, wired should win by default. 10.x.x.x should not be able to reach any other 192.x.x.x device UNLESS there's a route to it.
You also LIKELY have TWO DHCP servers (one for 10, one for 192). If you run IPCONFIG /ALL what is the DHCP server for each connection? (It's theoretically possible you have a multihomed server providing DHCP, but I suspect the wireless access point is providing DHCP for wireless and another device is providing it for wired. I don't want to confuse things but here is an example that's easy to understand. Check out the attached diagram.
In the diagram it says to turn off the DHCP on the 'switch and access point' router. Now all the DHCP leases come from the main router.
Note that this is a hybrid use of a 'normal' commodity router. So, any DHCP requests that come to it just run through the 'switch' part and on to the main router. But, if you.don't.
Wired Mac Address
turn off its DHCP then you will have 2 DHCP servers running across the entire network. A clarification on subnets vs. LANs re: 10.xxx.xxx.xxx and 192.xxx.xxx.xxx: Think of a LAN as 'copper wire' and a subnet as a logical addressing scheme. Often the two are unfortunately taken as synonymous - because that's the most common reality. However, it's not good terminology. Multiple subnets can live on the same copper wire. It's not common practice but it can be done.
So, one NIC can have an IP address on both subnets. But, I know of no DHCP server that will serve up more than one subnet with leases. and I say nothing here about gateways. An exercise left to the student. For instance DHCP hand out of IP addresses in our Environment is not done through a router, but DHCP server. I believe that you can have 2 DHCP servers,one for the Wired client and for Wireless. One DHCP server will not be able to hand out IPs to 2 different networks, even with second NIC when Swapping from Wired to Wireless then back to wired and so on.
How do computers release the old IP to get the new one automatically? Regarding DNS, if ComputerX connect to ComputerA, (that gets its IP changing) then it needs some kind of automatism that flushes its DNS, since ComputerA might have changed and IP and ComputerX still remembers the old one. It is possible to do that, depending on how the network is structured. Could be for various reasons, such as VLANs or a router on the wired. The operation is the same both ways to get a DHCP address. If you're wondering exactly how DHCP works, that's a long story that is more worth giving you a link to.
That said, here you go: Both network cards can have IP addresses at the same time. Now if you're wondering how a computer can switch between each, that is more of an operating system function, NOT a network related function. In terms of looking up a machine that has had an address change, a lookup takes place once the last known address has failed, which is a request that Computer X would send to the DNS server.
This result would be used to update Computer X's DNS cache. (I've skipped over the fact that before a DNS request is sent, the Computer X would have already checked its existing DNS cache AND hosts file). @Fred - you use a DHCP Relay Agent to forward requests to ONE DHCP Server that handles DHCP for multiple subnets. To clarify, DHCP relay (or IP helpers) can forward broadcasts to multiple servers, as well as to one (or more) servers for multiple subnets.
In a Network where they have Wireless and Wired Network, can they have the same DHCP server that hands out IP addresses for both Networks. I believe that they can have on DHCP with separate scope for wireless. You can have a DHCP server hand out addresses for both wired and wireless clients, but the DHCP server doesn't actually know what's wired and what's wireless. All it cares about is serving IP addresses to clients that ask. You can have a scope for wired and a separate scope for wireless but generally only if the wired and wireless clients are on separate VLANs.
Wired Network: Dhcp For Mac Download
That then enables you to configure different options for each scope. You could get into the realms of subscriber IDs, etc, but that's way outside of the scope of this question. For instance if I have a Laptop that use sometimes Wireless and sometimes wired Network, in this case DHCP server will hand out 2 IP addresses since 2 different Adapters(wired/wireless), then how DHCP will update the A record in DNS, with IP given to the wired or to the wireless adapter?
Mac Dns Dhcp
It depends on how the DHCP server is configured, and whether the client requests an update to occur via the 'dnscache' service. You can configure the DHCP server to dynamically update DNS records. However, if clients have multiple NICs this will result in multiple DNS records for the client, as this is tracked in DHCP by MAC address (the Unique ID).
This could mean that clients are unreachable if the wired A record is returned while it's only connected wirelessly, for example, so you must be careful with this. All Cisco layer-3 switches do DHCP relay (IP helper in Cisco speak). It's the function of a router to do relay, so all layer-3 switches must include this feature as they're 'doing routing'. Are you still wondering how a device with two network card can get 2 IP addresses?
Each network card has a unique MAC address, which is what DHCP looks at. So as far as the DHCP server is concerned, each network card is a unique device.
A bit like a person having two cell phones. Each one would be assigned a different number, even though the same person owns them. If a system has two IP addresses, then if you look in DNS by IP, then yes there will be 2 entries that resolve to the same hostname. If you look by hostname, you will only get one result. As pointed out earlier, that result would be for the network card that connected first (in the Windows world at least).